Circulatory System Essay

The partiality and inventory be the transport carcass in the embody. This appellative looks at the social harmoniumisation and get going of the circulatory system and withal includes a diagram of the circulatory system. The middle is a hollow muscular organ which bes as a pump, located in the dressing table and lies odd over(p) behind the sternum. telephone line vessels besides transport countercurrent end-to-end the body (Wikipedia). thither ar 3 major types of vessels which will be discussed subsequently in the assignment. The blood is a briny component of the body. It is used to transport materials, act as a defence against disease, helps regulates temperature of the body and helps with blood clotting. The blood is make up of 4 elements Plasma, Red blood cells-erythrocytes, fair blood cells-Leucocytes and Platelets.Plasma makes up the of import composition of blood with 55% volume. It decl ares 90-92% pee and is slightly dim and is straw act upon fluid. Red blood cells-erythrocytes are made in the ram marrow of the ribs and sternum and are broken down in the spleen and liver. The chief(prenominal) locomote is to have got oxygen. White blood cells-Leucocytes are big than red blood cells. Their briny function is to protect the body from certain infections. Platelets are formed in the red bone marrow. It has an important function in blood clotting. Blood vessels are comprised of 3 main units, arteries, veins and capillaries. Arteries carry blood away from the join.Their body structure is made up of a thick, stretchy muscular groyne, they have a stipulate profound tube and they contain no valves. Arteries branch into smaller tubes called arterioles and then into capillaries. Their main function is to carry oxygenated blood. Veins carry blood towards the heart. Its structure is made up of edit out walls with little muscle, they have a all-inclusive central tube and they also contain valves. Veins branch into venules and then into capillaries. Veins main function is to carry deoxygenated blood. Capillaries carry blood between arteries and veins.Their structure is of a thin wall with only one cell thick and a very natural central tube. Substances can only leave or enter the bloodstream through and through the capillaries. They are mainly responsible for bringing indispensable substances to the cells and draining waste materials away (Encyclopedia Britanica). There are 4 chambers, or decipherable spaces inside the heart that fill with blood. cardinal of these are called the atria the other two are called the ventricles. The left ventricle contracts most forcefully, so you can best feel your heart pumping on the left side of your chest (www.fi.edu).The pathway of blood through the valet heart consists of a pulmonic tour of duty and a systemic circuit. Deoxygenated blood flows through the heart in one direction, debut through what is known as a superior vena cava and then into the even off atrium wh ich is then pumped through the angulate valve into the right ventricle before cosmos pumped out through the pulmonary valve to the pulmonary arteries into the lungs.It then returns from the lungs via the pulmonary veins to the left atrium where it is pumped through the mitral valve into the left ventricle before leaving through the aortic valve to the aorta. In conclusion this assignment has looked at the functions and structure of the circulatory system. It has also identified the diagram of the circulatory system.